Steve Collins wants to fight on, but the former WBO champion will leave the decision to his medical men.

A neurologist's report on Monday will dictate whether the Irishman has a future in the sport after being out of boxing for almost two years.

Collins, who believes he had a black-out at the start of a sparring session with British middleweight champion Howard Eastman on Monday, spent the night in Homerton Hospital, east London.

Collins underwent tests and a CAT scan, and said yesterday: "I didn't feel good going into the ring and I should have been honest with my trainer Jimmy Tibbs.

"I felt as though my head exploded, I felt dizzy, I needed a rest. I more or less went on the floor and I sat up in the ring and I felt light-headed. I was not taking any punishment and the session had only just started. In layman's terms you could call it a black-out.

"I don't believe it is serious, it could be a blip or a warning.

"A neurosurgeon read me my results and advised me what to do, and asked to see me again on Monday.

"He didn't say anything about boxing. The decision on my future is not mine; it depends on what the doctors say. When I know the facts then it will be my decision.

"Of course I'd love to box on. But this certainly got my attention. It's not happened to me before in boxing, but I've had headaches when I've not been boxing.

"I've got some questions to ask the neurosurgeon, which he was not in a position to answer earlier this week after the initial tests."

Whatever the conclusion of the neurosurgeon at Homerton Hospital, the British Boxing Board of Control would doubtless want to conduct their own tests before the Irishman fights again in Great Britain. Collins was due to have his comeback fight in Cardiff on June 5th, but that plan has now been abandoned.

Collins (34) has not fought since stopping America's Craig Cummings in Glasgow in July 1997, his seventh defence of the WBO super-middleweight crown.

Collins has earned around £1.5million from boxing.